Vibration

[Big Matt]

Hi Guys My lovely smooth S2 (ABY) has acquired a noise out of the blue at around 2000rpm,its a low type of noise like if are doing 30 mps in 6th & floor it you get that deep noise (thats the noise it makes) + it has also acquired a fine vibration on the gear knob .
As popular as this may be with my girlfriend & do not appreciate it.
It starts at 1700rpm & by 2300rpm its all gone & everything is back to normal .
Performance seems fine & so does fuel consumption .
Any Ideas as the local garages don't have a clue about s2 (a couple even told me Audi don't make a 5 cylinder turbo ) .
I cant locate the source as I need a load on the motor & it does is in every gear at the same revs.
Just thought I would see a these cars seem to get the same problems

Cheers

[dan_b]

It sounds like a little bit like the vibration I get at around the same rev band - I would firstly suspect the condition of your rear diff mounts and gearbox mounts, check to see how worn they are. Do you also get a "thunk" on changing gear when you bring the clutch up quickly?

[Big Matt]

No other thunks or anythink ,just at 2000rpm.
Very odd?
How do you tell if they are worn ?

[dan_b]

How old is your S2?
You need to get it up on a ramp and basically test the movement/play /resistance that is in them. I'm sure they're shot by your description. Do you get any "jerks" when you come off the throttle through the transmission?

[newsh]

Someone else had these symptoms and it was a cracked CV joint I think? I'd also check engine and diff mounts for play.

[Big Matt]

Cheers will get it up on the ramps tomorrow.
How much is to much play for the box or diff mounts to be fooked.
its a 1996 with 121000. no real mods.

[BosnianS2]

that sounds to me as possible driveshaft from transmission to the rear diff vibration. i would check all joints on that driveshaft for play. I had similar problem on my 87 audi 5000 quattro, and took drove shaft off, and fron cv joint was totaly dry. i dissasembled the cv joint, cleaned everything and stuffed it with fresh grease, and problem went away.